共查询到20条相似文献,搜索用时 671 毫秒
1.
姚志远 《应用数学和力学(英文版)》2002,23(3):350-354
IntroductionVibratingobjectsunderwater,suchassubmarineandtorpedo ,transmitnoisetowardsexternalsoundfield ,formachineryvibrationofinsidepowerapparatus.Itwillenhancegreatlytheconcealmentofsubmarineandtorpedoandenforcefightingpowerbycontrollingnoiseofsubma… 相似文献
2.
The Space-Time Finite Element Method for Parabolic Problems 总被引:1,自引:0,他引:1
IntroductionTheequationsweconsideredareasfollowsut-Δu =f(u) , Ω× [0 ,T] ,u| Ω =0 , Ω× [0 ,T] ,u( · ,0 ) =u0 ,Ω ,( 1 )whereΩ ∈R2 ,thefunctionf(u)satisfies|f(u)|≤c|u| , u∈C(Ω) . ( 2 )Andf(u)isLipschitzcontinuous,i.e.itsatisfies|f(u) -f(v) |≤L|u-v| , u ,v∈C(Ω) ,( 3 )whereLisLipschitzconsta… 相似文献
3.
潘佳庆 《应用数学和力学(英文版)》2000,21(11):1331-1337
IntroductionThefastdiffusionequationofdivergenceformasut =(a(u)ux) x b(u) x c(u) (a( 0 ) = ∞ ) ( 1 )hasimportantphysicalbackground ,suchas [1 ] .Inrecentyears ,someresultsabout ( 1 )havebeenobtained .Forexample ,[2 ] ,[3]respectivelydiscussedtheCauchyproblemsforequation( 1 )andut=(… 相似文献
4.
IntroductionThetermhybridisusedtodescribecompositescontainingtwoormoretypesoffibersinacommonmatrix .Hybridcompositeshaveseveraladvantagesascomparedwiththosefabricatedwithasinglefibertype .Thereforenowtheyhavebeenwidelyusedinmanyfieldssuchasaeronauticsa… 相似文献
5.
IntroductionWeoftenmeettheproblemofsolvingequationofparabolictypeinmanyfieldssuchasseepage ,diffusion ,heatconductionandsoon .Inthecaseof3_dimension ,themodelisaninitialandboundaryvalueproblemasfollows: u t = 2 u x2 2 u y2 2 u z2 (0 <x,y,z<1 ;t>0 ) ,u(x ,y,z,0 ) =φ(x ,y ,z)… 相似文献
6.
李常品 《应用数学和力学(英文版)》2000,(3)
IntroductionOnekindofsteadystatereaction_diffusionequationsisreadas([1,2],etc),F(u,μ)=u″ μ(u-uk)=0(1)withboundaryvalueconditionu(0)=u(π)=0,(2)whereμisaparameter,1<k∈Z .LetX=u∈C2[0,π]|u(0)=u(π)=0,Y=C0[0,π].ThenF(u,μ)isamapfromX×RontoY.Wedefineinnerproductsonthesespacesby〈u,v〉=∫π0u(ξ)v(… 相似文献
7.
王凡彬 《应用数学和力学(英文版)》2000,21(11):1338-1340
Therearemanydocumentsthatdiscussblow_upofthesolutionsfortheinitial_boundaryvlueproblemsofthenonlinearSchr dingerequations,suchaspaper [1 ] .Butthepaper [1 ]hasoneweakpoint,thatis,itcannotunitediscussionforblow_upofthesolutionsfortheinitial_boundaryvalueprobl… 相似文献
8.
IntroductionConsidertheperiodicboundaryvalueproblemoftheordinarydifferentialequationsLu≡u″(t) +gradG(u) =p(t) ,u( 0 ) =u( 2π) ,u′( 0 ) =u′( 2π) ,( 1 )wherep∈C(R ,Rn) ,G ∈C2 (Rn,R) .TheequationmaybeinterpretedastheNewtonianequationofmotionofthemechanicalsystemsubjecttoconservati… 相似文献
9.
ANALYTICAL SOLUTION OF RADIATION SOUND PRESSURE OF DOUBLE CYLINDRICAL SHELLS IN FLUID MEDIUM 总被引:6,自引:0,他引:6
IntroductionSoundradiationfromthedoubleshellswhicharethemainstructureofsubmarinehullsunderexcitationinfluidmediumisveryimportantforstudyingthesubmarinehidingtechnology .Forthevibrationcharacteristicofdoubleconcentricshells,ithasbeenstudiedontheoryande… 相似文献
10.
IntroductionRecentlytheauthorspresentedanewdynamicsmodelfortrafficflow[1].Themodelcomprisesacontinuumequationandadynamicsequation k/ t+ (ku) / x=0 ,( 1 ) u t+u u x=ue(k) -uT +a u x,( 2 )wherekistrafficdensity ;uismeanspeed ;x ,tarespaceandtimecoordinatesrespectively .Tisrel… 相似文献
11.
On the existence of periodic solutions to higher dimensional periodic system with delay 总被引:1,自引:0,他引:1
Consideringthehigherdimensionalperiodicsystemswithdelayoftheformx′(t)=A(t,x(t))x(t)+f(t,x(t-τ)),(1)x′(t)=gradG(x(t))+f(t,x(t-... 相似文献
12.
In this paper we begin a study of the differential-delay equation
相似文献
13.
D. V. Bel’skii 《Nonlinear Oscillations》2005,8(1):1-6
We establish new properties of C
1 [τ(1), + ∞)-solutions of the quasilinear functional differential equation
14.
黄先开 《应用数学和力学(英文版)》1999,20(10):1116-1120
IntroductionIntherecentyears,withalotofapplicationsofneuralnetworkmodels,manyauthors[1~3]areinterestedintheresearchofthestructureandperformanceforthesenetworks.BecauseHopfieldneuralnetworkwellsimulatetheecologicalsystem,manystudiesareconcentratedonth… 相似文献
15.
We investigate the asymptotic behavior of solutions of the damped nonlinear oscillator equation
16.
Michael Winkler 《Journal of Dynamics and Differential Equations》2005,17(2):331-351
The article deals with positive solutions of the Dirichlet problem for
17.
朱勇 《应用数学和力学(英文版)》1998,19(11):1059-1063
I.IntroductionItiswell-knobal.nthatKorteweg-deVriesequationisacanonicalmodeltodescribethebalanceofthenonlineareffectandthedispersiveeffectofaphysicalsystem.Thisequationpossessestheso-called'soliton"solution,whichhasbeenfoundnumericallybyZabuskyandKruskall'].Ho-c'Jlever,sometimesthebalanceofnonlinearityanddispersionofasystemmayleadtoa,integroditTerentialequationinsteadofadifferentialequation.Forinstance,inthestudyofvortexbreakdownofanunboundedrotatingfluidLeibovich12]derivedfollowingnonline… 相似文献
18.
We prove the following statement:
Theorem 1.
Let
E and
be an arbitrary infinite-dimensional Banach space and a continuous mapping, respectively. Then, for every
and > 0, there exists a continuous mapping
such that
19.
This paper deals with connected branches of nonstationary periodic trajectories of Hamilton equations
20.
We consider the Cauchy problem
, x(0) = 0, where a
000 = 0, a
001 = 0, and a
002 = 0, and prove the existence of continuously differentiable solutions x(0,] with required asymptotic properties. 相似文献
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